Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b9cba1d1b8ab15…

MALICIOUS

PDF

78.5 KB Created: 2021-06-03 07:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 38823bed0eaf29e40dabdf384dcfd53f SHA-1: 128c5dd4166c3140d2b68541929006c68a741938 SHA-256: e1b9cba1d1b8ab153a8d3767448dca62bcb6a32a6dda1cac55c1c51034da3d3f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/pbw?utm_term=download+raft+wars+hacked+online+games PDF link annotation
    • https://suzipokenefuju.weebly.com/uploads/1/3/3/9/133997801/9955885.pdfIn PDF document text
    • https://lagafuxomip.weebly.com/uploads/1/3/4/3/134347440/8835350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366646/normal_5ffbdb5645cf9.pdfIn PDF document text
    • https://sokowerifali.weebly.com/uploads/1/3/6/0/136053586/zobalilir.pdfIn PDF document text
    • https://govasosu.weebly.com/uploads/1/3/4/5/134519533/7566835.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/ff7976f7a141.pdfIn PDF document text
    • https://lazogipinu.weebly.com/uploads/1/3/1/0/131069887/kagozojedenewuwur.pdfIn PDF document text
    • https://tisizapotiw.weebly.com/uploads/1/3/0/7/130776245/5517603.pdfIn PDF document text
    • https://joxaguxurotaz.weebly.com/uploads/1/3/7/5/137507581/4077727.pdfIn PDF document text
    • https://wakabidodez.weebly.com/uploads/1/3/4/6/134632857/sixuw.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/basamep-kogevebi-seniwobidi.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/serenizigiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_6062e8ae341bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5fec9974a8930.pdfIn PDF document text
    • https://fapizorimuko.weebly.com/uploads/1/3/1/1/131164308/8478664.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/tezeburoborox.pdfIn PDF document text
    • https://bozobazevadetob.weebly.com/uploads/1/3/1/6/131607158/pigebifimoz_zuwarefididef_dobokoxopazog_kexozove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483359/normal_60048f75bb5fc.pdfIn PDF document text
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/fowezowox.pdfIn PDF document text
    • https://memesuxiti.weebly.com/uploads/1/3/4/6/134635319/sawisebatuwuze-bowenodakisabas.pdfIn PDF document text
    • https://damenuxorofupob.weebly.com/uploads/1/3/4/7/134711178/71aad7c363f9315.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/1793351.pdfIn PDF document text
    • https://vogemafebin.weebly.com/uploads/1/3/4/2/134235603/47b52b5f7fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redelaw.pbworks.com/f/suma_de_vectores_mtodo_del_paralelogramo_-_ejercicios_resueltos_fsica.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/w/file/fetch/144463641/is_wrist_blood_pressure_monitors_accurate.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144421374/9768212217.pdfIn PDF document text
    • http://garifukedako.pbworks.com/w/file/fetch/144426753/what_ink_does_epson_artisan_1430_use.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/f/bosch_vp44_service_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 5592 bytes
SHA-256: 1b1e840daa3ecb38c90709fdc80202d9d4be41a5f7f832e46cfe6e23a1409ced
font_01_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 11032 bytes
SHA-256: 5b52f782f23dc4481362a9ae171a22950ff4cfa4ca35844c24e19572790e49c5

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